hasReachedBottom.js

// 判断滚动条是否已经到页面底部
$(window).scroll(function() {
	var scrollTop = $(this).scrollTop();
	var scrollHeight = $(document).height();
	var windowHeight = $(this).height();
	if (scrollTop + windowHeight == scrollHeight) {
    	console.log('滚动条已经到达页面底部');
	}
});